<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title></title>
    <style>

        .parent {
            width: 400px;
        }
        .box {
            width: 100px;
            height: 100px;
            float: left;
            border: 1px solid rgb(144, 12, 63);
            margin: 20px;
            text-align: center;
            line-height: 100px;
            color: #fff;
            font-size: 50px;
            background-color: rgb(255, 141, 26);

        }

        /*画圆形的方式一*/
        .box:nth-child(1) {
            border-radius: 50px;
        }

        /*画圆形的方式二*/
        .box:nth-child(2) {
            border-radius: 50%;
        }

        .box:nth-child(3) {
            border-radius: 100px 0 0 0;
        }

        .box:nth-child(4) {
            border-radius: 100px/50px;
        }

        .box:nth-child(5) {
            border-radius: 10%;
        }

        .box:nth-child(6) {
            border-radius: 0 100px;
        }

    </style>
</head>
<body>

<div class="parent">
    <div class="box">1</div>
    <div class="box">2</div>
    <div class="box">3</div>
    <div class="box">4</div>
    <div class="box">5</div>
    <div class="box">6</div>
</div>
</body>
</html>
